Correct option is B
The correct antonym of the given word is (B) Pessimist.
Optimist: A person who tends to be hopeful and confident about the future or the success of something. They usually see the positive side of things.
Optimist: आशावादी व्यक्ति
Example: Despite the failure, an optimist keeps believing that success is possible.
Pessimist: A person who tends to see the worst aspect of things or believes that the worst will happen.
Example: A pessimist expects things to go wrong, even in good situations.
Synonyms: hopeful, positive thinker, dreamer, idealist.
Antonyms: pessimist, cynic, skeptic, defeatist.
• Meanings of all the other given options:
▪ A. Unstable:
Hindi: अस्थिर
English: Not steady or secure; likely to change suddenly.
▪ C. Sparse:
Hindi: विरल, कम
English: Thinly dispersed or scattered.
▪ D. Flexible:
Hindi: लचीला
English: Capable of bending easily without breaking; adaptable.